Brush-holder-supporting device.



C. W. STARKER.

BRUSH HOLDER SUPPORTING DEVICE. APPLICATION FILED NOV. 6. m4.

Patented Dec. 31,1918.

INVENTOR mar/e5 14/ .5720? BY v W I I ATTORNEY WITNESSES:

C. W. STARKER. BRUSH HOLDER SUPPORTING DEVICE.

APPLICATION FILED nov. a. 1914.

1 ,289,295 Patented Dec. 31, 1918.

2 SHEETS-SHEET 2- WITNESSES: INVENTOR am WWW 7 M Q Q ATTORNEY nummm IKYIIS m. run'muma. \IAsmucwn. n. c.

UNITED STATES PATENT OFFICE.

CHARLESW. STARKER, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTING HOUSE ELECTRIC AND MANUFACTURING COMPANY, CORPORATION OF PENN- SYLVAN IA.

BRUSH-HOLDER-SUPPORTING- DEVICE.

Patented Dec. 31, 1918.

Application filed November 6, 1914. Serial No. 876,600.

To all whom it may concern:

Be it known that I, CHARLES W. STARKER, a subject of the Emperor of Germany,and a resident of Pittsburgh, in the county of Alle gheny and State of Pennsylvania, have invented a new and useful Improvement in Brush-Holder-Supporting Devices, of which the following is a specification.

My invention relates tov brush holder sup ports for dynamo-electric machines, and particularly to a ty e of brush holder support that is adapter to be mounted on the end bracket of a dynamo-electric machine.

One object of my invention is to provide a strong and suitably insulated support for brush holders, while another object of my invention is to provide a brush holder support that may be easily detached from the sustaining end bracket withoutfirst removing the end bracket from the frame of the dynamo-electric machine.

Heretofore, it has beenthe practice to carry brush holders on rods fixedly mounted on an end bracket and extending parallel to the axis of the commutator cylinder or slip rings. With this construction, it was found difficult to remove the brush holders from their supporting rods or to remedy any defects in the insulation between the brush rod and the end bracket after the machine had been assembled. Such difiiculties were caused by the limited clearances existing between the brush holder rods and that portion of the rotor adjacent to the commutator cylinder or slip rings, thereby making it necessary to detach the end bracket from the frame in order to remove the brush holders or the brush holder support.

By the use of my invention, the brush holder support is removably mounted on an end bracket. Furthermore, the support is so mounted on the bracket that it may be easily withdrawn from the outside, thus permitting the removal of brush holders or repairs to the insulation despite small clearances between the brush holder rod and that portion of the rotor adjacent to the commutator cylinder or slip rings.

In the accompanying drawings, F igur 1 is a longitudinal sectional view of a brush holder support constructed in accordance with my invention; Fig. 2 is a sectional view taken on the line IIII of Fig. 1; Fig. 3 is a longitudinal sectional view of a modification of the structure shown in Fig. 1;

Fig. 4 is a sectional view taken on theline IV-IV of Fig. 3; and Fig. 5 is a view, in side elevation, of a dynamo-electric machine equipped with a brush holder support constructed in accordance with my invention.

A sheet metal bearing bracket 1 is pro vided with a substantially circular opening 2 around which radial lugsor projections 33 are formed to support a bushing 4, preferably of Babbitt metal, that may be cast into and around the opening 2 to extend on both sides of the bearing bracket l. A metal sleeve 5 is provided with a. flange or head 6 and a threaded portion 7 so that, when the sleeve .5. is inserted in the bushing 4, the threaded portion 7 is located adjacent to the inner end of the bushing. A nut Son the threaded portion 7 serves to retain the sleeve 5 Within the bushing by holding the flange or head 6 against the outer end face of the bushing 4..

A brush holder rod 9 of any suitable length has a knurled portion 10 adjacent to one end and is further provided with a threaded collar 11. which may be shrunk upon it. The knurled portion 10 is of somewhat smaller diameter than the inner diameter of the sleeve 5 and extends therein substantially to the plane of the engaging faces of the bushing 4 and the head 6.

The brush holder rod 9 is separated from the sleeve 5 by a tube 12 of insulating material, while a ring 13 of the same material as the tube 12 is interposed between the end of the sleeve 5 and the threaded collar 11. A second insulating ring 14 fits closely upon the ring 13 and is of such inside diameter as To pass over the threaded collar 11 and abut against the end of the sleeve 5. A nut 15 on the threaded collar 11 bears against the ink sulating rings 13 and 14, and a nut 16 cooperates with the nut 15 to clamp an electric conductor terminal 17 in position upon the brush holder rod 9.

The tube 12 fits closely Within the sleeve 5 and the rod 9 is further insulated from the sleeve by a suitable insulating cement that fills the grooves of the knurled portion 10 and the space 18 between the end of the rod 9 and the outer face of the sleeve 5. A metal cap 19 serves to retain the cement within the sleeve and to protect it.

The brush holder rod 9 and the sleeve 5 thus form a substantially unitary structure which may be readily detached from the bearing bracket or end bell by removing the nut 8 from the threaded portion 7 and the nuts '15 and 16 from the collar 11. The sleeve 5 may then be withdrawn from the bushing L by taking hold of the head 6 which is located on the outside of the bearing bracket 1.

By referring to Fig. 5, it .may be seen that, as the brush holder rod 9 is withdrawn, the brush holders may be easily removed, no matter how small may be. the clearances be tween the armature 21, the commutator cylinder 22 and the brush rod 9.

A modification of my invention is shown in Figs. 3 and t where a cast bearing bracket is provided with a cylindrical lug or projection 23 that is adapted to receive the sleeve and the brush holder rod. The sleeve is provided, at its outer end, with a nut 2 k in place of the flange or head 6 shown in Fig. 1. A. set screw 25 in the projection 23 has an ex tension 26 of reduced diameter, adjacent to the threaded portion, which engages a slot 27 extending the full length of the sleeve 5. The extension 26 prevents the sleeve from turning in its support.

' While I have shown my invention in its simplest and preferred form, it is not s0 limited, but is capable of various modifications within the scope of the appended claims.

Gopies of this patent may be I claim as my invention:

1. In a dynamo-electric machine, the combination with an end bell provided with an opening therethrough located in other than annular relation to the armature shaft, of a brush-holder stud mounted in saidopening by insulating mounting means, and brushholders carried by said stud, the transverse dimensions of said stud being less than those of said opening, whereby said stud may be removed through said opening.

2. In a dynamo-electric machine, the combination with an end-bell provided with an opening therethrough located in other than annular relation to the armature shaft, of a sleeve seated in saidv opening and in claniping engagement with the inner and outer faces of said end bell, respectively, and a brush-holder stud carriedby said sleeve and insulated therefrom, the transverse dimensions of said stud being lessthan those of said sleeve, whereby said stud and its associated supporting means may be bodily removed through said opening.

In testimony whereof, Ihave hereuntosub scribed my name this 31st day of Oct. 1914.

CHARLES W. STARKER.

Witnesses:

Geo. J. Sumner, B. B. HINES.

obtained for five cents each, by addressing the. Commissioner of Patents,

Washington, D. G. 

